Canonical Tag Checker Free SEO Tool
Check canonical tags, validate URLs, and identify duplicate content issues—all for free.
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Frequently Asked Questions
What is a canonical tag and why is it important?
A canonical tag (rel="canonical") tells search engines which version of a URL is the master copy. It helps prevent duplicate content issues and consolidates ranking signals.
Why is my canonical tag not being detected?
Common reasons: the tag is malformed, not in the
section, JavaScript-generated (our tool checks raw HTML), or the page requires login.What does "Canonical points to 404" mean?
This means your canonical URL returns a 404 error. Search engines will ignore it, potentially causing duplicate content issues.